All died as a result of the high temperatures that roasted the Northeast last week, said Grace Brugess, a spokeswoman for the office. Temperatures peaked at 96 in New York on Friday and 93 on Saturday, with high humidity that drove the heat index up to or over the 100 mark.

Hot weather is particularly dangerous to children, the elderly and people with heart and lung conditions, as air quality plummets while ozone levels soar.